Cutter head



July 3o, 19,29. F, L LANE 1,722,363

CUTTER HEAD i Filed Dec. 5, 19.27

Patented July 30, l929.

FRANKLIN L. LANE, OF BELOIT, WISCONSIN, ASSIGNOR TO vYATES-AMEiRlICAN MA- CHINE COMPANY, F BELOIT, WISCONSIN, A CORPORATION OF I)IEILAVVARE.k

CUTTER HEAD.

Application filed Decem'be1- 5, 1927. Serial No. 237,686.

The principal object of the invention is to provide improved means in association with a cutter head for holding the centerportions of the knives down against the seats.

Other objects and advantages of the invention will be evident to those skilled in the art upon a full understanding of the construction, arrangement and operation of a cutter head having the improved center hold down feature.

One form of the invention is presented herein for the purpose of exemplification,

but it will of course be understood that the invention is susceptible of embodiment in other structurally modified forms coming equally within the scope of the appended claims.

In the accompanying drawing:

Fig. 1 is an end view of a cutter head constructed in accordance with the invention; and

Figs. 2 and 3 are two different face views of the same.

The cutterhead shown in the drawing is provided with a number of wide flat seats which are adapted to receive a corresponding number of wide flat knives 11. The side portions 12 and 13 of the knives are held down against the side portions of the seats by clamps 14 and 15, while the center portions 16 of the knives are held down against the center portions of the seats by novel means 17--in which means the present invention resides.

The clamps 14 and 15 are 'll-shaped and are drawn up into proper position against the knives by ybolts 18 which pass through openings in the clamps and screw into the sides of the head at points inwardly of the seats. The clamps 14 have flat outer portions 19 which hook over flat surfaces 20 on the side port-ions 12 of the knives, and have beveled inner portions 21 which wedge inwardly against beveled surfaces 22 in grooves 23 in one side of the head; while the clamps have beveled outer portions 24 which wedge inwardly against beveled surfaces 25 on the side portions 13 of the knives, and have flat inner portions 26 which hook under flat surfaces 27 in grooves 28 in the other side of the head.

From the construction thus far described, it will be understood that the clamps 14 draw the side portions 12 of the knives inwardly against the seats, while the clamps `15 ergert a wedging action Vagainst the side portlons 13 of the knives serving both to draw such side portions inwardly and to force the same laterally on the seats in the direction of the center hold down means17.

The center hold down means 17 consists of undercutribs 29 on the top surfaces lof the seats in engagement with undercut grooves 30 in the bottom surfaces of the knives, the cooperating undercut abutments being held in wedged association by the action of the clamps 15 in forcing the abutments on the knives against theabutments on the seats. The ribs and grooves extend in the plane of rotation of the cutter head, whereby to provide an effective lcenter hold down for the knives near the cutting edges of the same regardless of the extent to which the knives may be advanced on the seats.

The ribs are preferably 'produced by dovetailing separate members into the seats, and the seats are preferably provided at both sides of the ribs with serrations 31 which extend from side to side through certain areas and interfit with corresponding serrationsV on the knives.

The word center, as used in the preceding description and in the following claims, is intended to define any location on the knives or seats intermediate the side edges of the same.

I claim:

1. In a cutter head, a knife seat provided with an abut-ment which is adapted to automatically interlock with an abutment on an associated knife intermediate the side edges of the latter to hold the knife down against the seat and means engageable with one of the sides of the knife to hold such side down against the seat.

2. In a cutter head, a knife seat provided Vwith an abutment which is adapted to automatically interlock with an abutment on an associated knife intermediate the side edges of the latter upon the knife being secured to the seat tov hold the knife down against the seat, and means engageable with one of the sides of the knife to hold such side down against the seat and the abutment on the knife in interlocked engagement with the abutment on the seat.

3. ln a cutter head, a knife seat provided with an undercut abutment which is adapted to interlock with an undercut abutment on an associated knife intermediate the side edges of the latter upon the knife being secured to the seat, and means engageable with the sides of the knife to hold such sidesv doWn against the seat.

4. In a cutter head7 a knife seat provided With an undercut projection which is adapted to interlock With an undercut recess in an associated knife intermediate the side edges of the latter upon the knife being secured to the seat, and means engageable with the sides of the knife to hold such sides down against the seat.

5. In a cutter head, a knife seat provided withv an undercut rib which is adapted to interlock with an undercut groove in an associated knife intermediate the side edges of the latter upon the knife being secured to the seat, and means engageable with they sides of the knife to hold such sides down against the seat.

6. In a cutter head, a knife seat provided With an undercut rib which is adapted to' interlock With an undercut groove in an` associated knife intermediate the side edges of the latter upon the knife being secured to the seat, and means engageable with one of the sides of the knife to hold suoli side down against the seat and the groove in the knife in interlocked engagement with the rib on the seat, said rib being arranged in the plane of rotation of the cutter head whereby to permit retention of the interlock With the knife in advanced positions.

7. In a cutter head, a knife seat, a knife positioned on the seat, means for holding one side of the knife dovvn against the seat, means for holding the other side of the knife down against the seat, an undercut abutment on the knife intermediate the sides of the same, and a complementary abutment on the seat, one of said side 'holding means being so arranged as to force said abutments into wedged engagement.

8. A knife for application to a cutter head seat, provided in its center portion With an undercut abutment for coaction with a complementary abutment on the seat, and at one of its side portions With a formation adapted to coact With suitable holding means.

9. A knife for application to a cutter head seat, provided in its center portion With an undercut groove extending in the direction of cut for coaction With a complementary rib on the seat, and at its side portions with formations adapted to coact With suitable holding means.

In testimony whereof IV have hereunto subscribed my name.

FRANKLIN L. LANE.

CERTIFICATE 0F GORRECTIN.

Patent No. i,722,303. Granted Jliiy 30, 1929, t0

FRANKLIN L. LANE.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page l, line 93, claim i., aiter the word "seat" insert a comma; lines 101 and itil, claim 2, strike out the Words "to hold the kniie down 'against the seat" and insert the same to follow after the word "latter" in line Mii), same claim; and that the said Letters Patent should be read with these corrections therein that the .same may conform to the record of the case in the Patent Office.

Signed and sealed this 19th day of September, A. D. 1929.

M. J. Moore, (Seal) Acting Commissioner of Patents. 

